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TETRA TECH, INC. <br /> 4.0 FIELD SAMPLING PLAN <br /> 4.1 GENERAL INFORMATION <br /> Field activities will include groundwater, soil, and passive soil gas sampling. A minimum of one <br /> groundwater, soil, and soil gas sample will be collected at each boring location and sent to the off=site <br /> laboratory for analysis. The field work for this sampling effort is scheduled to begin in April—May 2014. <br /> All field work will be performed in accordance with this work plan and associated health and safety plan. <br /> Underground Service Alert will be notified at least 48 hours prior to beginning work on-site. All sample <br /> locations will be mapped in the field and recorded using a handheld Global Positioning System (GPS) <br /> navigator. Records of the field work, including samples collected, will be kept in a bound notebook <br /> unique to this study. Relevant forms for the field effort, including boring logs,are located in Appendix C. <br /> Any significant deviations from the work plan must be recorded in the field log book and a Record of <br /> Technical Field Change form must be completed(Appendix Q. <br /> 4.2 SITE LOGISTICS <br /> 4.2.1 Site Access <br /> Field work will be coordinated with the Tetra Tech Project Manager, Valerie Walker, whose contact <br /> information is given below. <br /> Valerie Walker <br /> Phone: (916)643-4826 ext. 124 <br /> daryl.sattelberp-a,tetratech.com <br /> 4.2.2 IDW Container Storage <br /> Any investigation-derived waste(IDW)generated during the drilling effort will be contained in 55-gallon <br /> steel drums. Secondary containment will be provided for drums containing liquid. All containers are to <br /> be marked as required by the disposal contractor. <br /> 4.2.3 Schedule <br /> Pending finalization of this work plan, field work is scheduled to begin in April—May 2014. Field work <br /> and Site restoration is expected to take one day. <br /> 4.2.4 Site Restoration <br /> Minimal physical impacts due to sampling activities are anticipated in the study area. Boreholes will be <br /> abandoned using grout and/or bentonite pellets, and the ground surface will be restored to its original <br /> state. The grout or bentonite pellets will be installed into the borehole using a tremie pipe or equivalent to <br /> prevent bridging and dilution of sealing materials. <br /> 4.3 DIRECT PUSH TECHNOLOGY DRILLING PROCEDURES <br /> Environmental borings will be advanced during this sampling effort using a DPT drill rig. Groundwater <br /> samples will be collected from the core barrel using a bailer or a pump. Generally, the preferred method <br /> of groundwater sample collection will be to lower a decontaminated bailer into the core barrel and <br /> retrieve the bailer to obtain the sample. If necessary the groundwater may be sampled using a temporary <br /> Sampling Effort Work Plan Page 4-1 <br /> Tracy Mansfield Property <br />